costly Meaning in the Cambridge English Dictionary
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Meaning of “costly” in the English Dictionary

"costly" in British English

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costlyadjective

uk   /ˈkɒst.li/  us   /ˈkɑːst-/

costly adjective (EXPENSIVE)

expensive, ​especially too ​expensive: a costly ​item a costly ​purchase The ​project was ​subject to several costly delays/​setbacks.

costly adjective (DAMAGING)

involving a lot of ​loss or ​damage: Building this ​bridge has already been too costly in ​terms of ​lives (= ​people have been ​killed while ​working on it).
costliness
noun [U] uk   us   /-nəs/
(Definition of costly from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"costly" in American English

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costlyadjective

 us   /ˈkɔs·tli/

costly adjective (MAKING YOU SPEND MONEY)

expensive: This ​procedure can be very costly.

costly adjective (MAKING YOU GIVE OR LOSE SOMETHING)

done by making you give or ​lose something of ​value: Her costly ​mistakeallowed the ​opponents to ​score.
(Definition of costly from the Cambridge Academic Content Dictionary © Cambridge University Press)

"costly" in Business English

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costlyadjective

uk   us   /ˈkɒstli/
costing a lot of ​money: costly ​repairs The delays in the ​schedule proved very costly.
harmful, and involving a lot of ​loss or ​damage: Their ​failure to ​consultstaffmembers was a costly mistake.
(Definition of costly from the Cambridge Business English Dictionary © Cambridge University Press)
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